A nano-alumina with high specific area was prepared using a homogeneous precipitation method with titanium dioxide and barium oxide as modifying additives.

The procedure consists of formulating a set of recommendations regarding the choice of parameter values for electrostatic precipitation.

The concentrations of N in the litterfall, precipitation, throughfall, litter layer, and soil were 0.74%-2.30%, 0.000,038%, 0.000,09%, 1.94%, and 0.59%, respectively.

Annual input of N through incident precipitation was 4.88 kg/hm2.

Effects of forest on precipitation chemistry and total suspended particles of stem-flow in Jiufeng National Forest Park, Beijing

Precipitation chemistry was monitored in two different types of forests (mixed Pinus tabulaeformis and Quercus variabilis forest and pure Q.

tabulaeformis in the mixed forest was 1.00 mS/cm, which was 5.88 times as high as that of precipitation outside the forest.

variabilis in pure and mixed forests show little difference, 0.34 and 0.30 mS/cm, respectively and were 2.00 and 1.76 times higher than that of precipitation.

tabulaeformis decreased over time and with an increase in the amount of precipitation.

The mean TSP of stem-flow in mixed forest was 116.95 mg/L, but 87.14 mg/L in the pure forest, which were 72.93 and 43.12 mg/L higher than that of precipitation.

The model took into account the major processes that address the relationships of plants and the environment, including soil characteristics, precipitation, infiltration, vegetation transpiration, and soil evaporation.